Nerd Love! Pick your coefficients, and see the love.

Here are some nerdy love for you.  Do you know the solution to the following equation?

sqrt(cos(x))cos(300x)+sqrt(abs(x))-0.7)(4-x*x)^0.1, sqrt(6-x^2), -sqrt(6-x^2) from -4.5 to 4.5

Well, if you want to find out, search it on google.  You can even play with the coefficients and pick your preferred shape of love.  Only I wish you can pick the color as well.  Or maybe it is only presented in the color of engineers?

Challenge:  Can you come up with more equations to add an arrow to the heart?